%0 Journal Article
%A Wituła, Roman
%T Ramanujan type trigonometric formulas: the general form for the argument $\frac{2\pi}{7}$
%J Journal of integer sequences
%D 2009
%V 12
%N 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/JIS_2009__12_8_a2/
%G en
%F JIS_2009__12_8_a2